2H-1-benzopyran, 6,7-dimethoxy-2,2-dimethyl- 6,7-dimethoxy-2,2-dimethyl-2H-chromene 6,7-dimethoxy-2,2-dimethyl2H-1-benzopyran 644-06-4 InChI=1/C13H16O3/c1-13(2)6-5-9-7-11(14-3)12(15-4)8-10(9)16-13/h5-8H,1-4H Preconene II